Stool with ring piston actuator



FIG. 1 is a top perspective view of a stool with ring piston actuator showing my new design therefor;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front elevational view, the rear view being a mirror image thereof;

FIG. 4 is a right side elevational view, the left side view being a mirror image thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

CLAIM The ornamental design for a stool with ring piston actuator, as shown and described. 